Java enum: Creating an Enum : Enum « Language Basics « Java

Home
Java
1.2D Graphics GUI
2.3D
3.Advanced Graphics
4.Ant
5.Apache Common
6.Chart
7.Class
8.Collections Data Structure
9.Data Type
10.Database SQL JDBC
11.Design Pattern
12.Development Class
13.EJB3
14.Email
15.Event
16.File Input Output
17.Game
18.Generics
19.GWT
20.Hibernate
21.I18N
22.J2EE
23.J2ME
24.JDK 6
25.JNDI LDAP
26.JPA
27.JSP
28.JSTL
29.Language Basics
30.Network Protocol
31.PDF RTF
32.Reflection
33.Regular Expressions
34.Scripting
35.Security
36.Servlets
37.Spring
38.Swing Components
39.Swing JFC
40.SWT JFace Eclipse
41.Threads
42.Tiny Application
43.Velocity
44.Web Services SOA
45.XML
Java » Language Basics » EnumScreenshots 
Java enum: Creating an Enum
Java enum: Creating an Enum
  

/*
License for Java 1.5 'Tiger': A Developer's Notebook
     (O'Reilly) example package

Java 1.5 'Tiger': A Developer's Notebook (O'Reilly) 
by Brett McLaughlin and David Flanagan.
ISBN: 0-596-00738-8

You can use the examples and the source code any way you want, but
please include a reference to where it comes from if you use it in
your own products or services. Also note that this software is
provided by the author "as is", with no expressed or implied warranties. 
In no event shall the author be liable for any direct or indirect
damages arising in any way out of the use of this software.
*/



import java.io.IOException;
import java.io.PrintStream;

enum Grade A, B, C, D, F, INCOMPLETE };

class Student {

  private String firstName;
  private String lastName;
  private Grade grade;

  public Student(String firstName, String lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }

  public String getLastName() {
    return lastName;
  }

  public String getFullName() {
    return new StringBuffer(firstName)
           .append(" ")
           .append(lastName)
           .toString();
  }

  public void assignGrade(Grade grade) {
    this.grade = grade;
  }

  public Grade getGrade() {
    return grade;
  }
}

public class GradeTester {

  private Student student1, student2, student3;

  public GradeTester() { 
    student1 = new Student("Brett""McLaughlin");
    student2 = new Student("Ben""Rochester");
    student3 = new Student("Dennis""Erwin");
  }

  public void testGradeAssignment(PrintStream outthrows IOException {
    student1.assignGrade(Grade.B);
    student2.assignGrade(Grade.INCOMPLETE);
    student3.assignGrade(Grade.A);
  }

  public void listGradeValues(PrintStream outthrows IOException {
    Grade[] gradeValues = Grade.values();

    // for loop
    for (int i=0; i<gradeValues.length; i++) {
      out.println("Allowed value: '" + gradeValues[i"'");
    }

    // for/in loop
    for (Grade g : gradeValues ) {
      out.println("Allowed value: '" + g + "'");
    }
  }

  public void testSwitchStatement(PrintStream outthrows IOException {
    StringBuffer outputText = new StringBuffer(student1.getFullName());

    switch (student1.getGrade()) {
      case A: 
        outputText.append(" excelled with a grade of A");
        break;   
      case B: // fall through to C
      case C: 
        outputText.append(" passed with a grade of ")
                  .append(student1.getGrade().toString());
        break;
      case D: // fall through to F
      case F:
        outputText.append(" failed with a grade of ")
                  .append(student1.getGrade().toString());
        break;
      case INCOMPLETE:
        outputText.append(" did not complete the class.");
        break;
      default:
        outputText.append(" has a grade of ")
                  .append(student1.getGrade().toString());
        break;
    }

    out.println(outputText.toString());
  }

  public static void main(String[] args) {
    try {
      GradeTester tester = new GradeTester();
  
      tester.testGradeAssignment(System.out);
      tester.listGradeValues(System.out);
      tester.testSwitchStatement(System.out);
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}           
         
    
  
Related examples in the same category
1.How to use enum
2.Enum with switch statement
3.Enum and GenericEnum and Generic
4.Media enumeration constantsMedia enumeration constants
5.Use an enum constructor.
6.Switching on Enum and Adding Methods to an Enum
7.An enumeration of apple varieties. An enumeration of apple varieties.
8.Use the built-in enumeration methods. Use the built-in enumeration methods.
9.Use an enum constructor, instance variable, and method. Use an enum constructor, instance variable, and method.
10.Java enum: Demonstrate ordinal(), compareTo(), and equals().Java enum: Demonstrate ordinal(), compareTo(), and equals().
11.Java enum: EnumMap and Ant statusJava enum: EnumMap and Ant status
12.Java enum: Enum inside class
13.Java enum and varargs
14.This program demonstrates enumerated types
15.Shuffler Enum
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.